Hakuōki also known as Hakuōki: Demon of the Fleeting Blossom on the PSP, Hakuōki: Memories of the Shinsengumi on the 3DS, Hakuōki: Stories of the Shinsengumi on the PlayStation 3, & Hakuoki: Kyoto Winds for the PlayStation Vita.

In Kyoto, Japan, near the end of the Edo period, a young boy is being chased through the streets at night by a pair of revolutionaries loyal to the Emperor. Hiding in an alley, the boy is horrified to witness his pursuers' brutal murder at the hands of demonic looking men with glowing red eyes, who laugh maniacally as they hack their victims to pieces. When the fiends turn their attention to the boy, his life is only spared by the timely appearance of two samurai belonging to a group of powerful warriors loyal to the Shogun, known as the Shinsengumi. Unsure just where the boy's loyalties lie, the Shinsengumi take him into custody and return him to their headquarters.

The next day, they are "shocked" to discover that the "boy" being held prisoner is, in fact, a girl named Chizuru Yukimura. Chizuru came to Kyoto in search of her missing father, an accomplished doctor of western medicine who she suddenly lost contact with several months ago. When the Shinsengumi reveal that they too have been in search of Dr. Yukimura in relation to the strange attacks that have been plaguing the city, they allow Chizuru to remain under their care and assist with the search. Agreeing to continue living as a boy so as not to distract the men who serve her new benefactors, Chizuru quickly becomes acclimated to their lifestyle and grows to genuinely care for each of them.

Her life soon becomes anything but peaceful, as the Shinsengumi's enemies seek to overthrow the Shogun and those loyal to him at any cost. At the same time, both the numbers and ferocity of the crazed men that Chizuru's protectors cryptically refer to as "failed soldiers" continue to increase. In the midst of one of the most chaotic eras in Kyoto's history, Chizuru grows determined to do everything she can to protect the lives of her new comrades.[1]